Xin'an Coal Industry Co., Ltd.

针对13上09材料巷掘进连续短距离揭露断层F3107-3和F3,落差分别为2.5m和5.1m,断层落差较大,且距离较近,耦合影响大,结合现场开展掘进工作面连续短距离过断层的安全风险辨识及安全技术措施研究。研究结论:掘进工作面连续过断层时存在风险较大,主要有顶板下沉、冒落、片帮、局部瓦斯超限、瓦斯积聚、拒爆和残爆等风险;断层面前后5m范围内巷道按照梯形断面施工,锚网带索棚注支护,循环进尺为0.8m,永久支护到迎头最大空顶距离为1.2m;复合支护时,断层面前后5m范围架设工字钢棚加强支护,棚梁及棚腿采用11#矿用工字钢,针对临时支护采用3根金属前探梁或轻型单体液压支柱。

Aiming at the continuous short distance exposure of faults F3107-3 and F3 in the excavation of the 13upper09 material roadway, with a drop of 2.5 m and 5.1 m respectively, the faults has a relatively large drop and is relatively close in distance, resulting in a significant coupling impact. Combined with the safety risk identification and safety technical measures research of the on-site carried out excavation working face continuous passing through faults in short distance. The research conclusion: When the excavation working face passes through faults continuously, there are significant risks, mainly including roof subsidence, collapse, fragmentation, local gas exceeding limits, gas accumulation, refusal to explode, and residual explosions; within a range of 5 m in front of and behind the fault, the tunnel is constructed according to a trapezoidal cross-section, with anchor mesh and cable shed injection support. When the cyclic footage is 0.8 m for permanent support and the maximum distance from the head to the empty roof is 1.2 m for composite support, an I-beam shed is erected within a range of 5 m in front of and behind the fault to strengthen support. The shed beam and legs are made of 11# mining I-beam, and for temporary support, 3 metal front probing beams or light single hydraulic pillars are used.